How to ignore the case sensitivity in List

Question

Let us say I have this code

string seachKeyword = \"\";
List sl = new List();
sl.Add(\"store\");
sl.Add(\"State\");
sl.Add(\"STAM         


        

Answer 1

StringComparer.CurrentCultureIgnoreCase is a better approach instead of using indexOf.

Answer 2

The FindAll does enumeration of the entire list.

the better approach would be to break after finding the first instance.

bool found = list.FirstOrDefault(x=>String.Equals(x, searchKeyWord, Stringcomparison.OrdinalIgnoreCase) != null;

Answer 3

You can apply little trick over this.
Change all the string to same case: either upper or lower case

List searchResults = sl.FindAll(s => s.ToUpper().Contains(seachKeyword.ToUpper()));

Answer 4

The optimal solution will be to ignore the case when performing the comparison

List<string> searchResults = sl.FindAll(s => s.IndexOf(seachKeyword, System.StringComparison.OrdinalIgnoreCase) >= 0);

Answer 5

Below method will search your needed keyword and insert all searched items into a new list and then returns new list.

private List<string> serchForElement(string searchText, list<string> ListOfitems)
{            
    searchText = searchText.ToLower();
    List<string> Newlist = (from items in ListOfitems
                         where items.ToLower().Contains(searchText.ToLower())
                         select items).ToList<string>(); 

return Newlist; }